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Trivia: Vincent Price reportedly signed on because he was impressed with the script. However, shortly after signing on, the script was hastily re-written, and the final draft bore little resemblance to the one Price had read when he signed on.

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Trivia: Whereas the first "The Fly" was in color, this sequel was actually filmed in black-and-white. This was reportedly a cost-saving measure, similar to how the film re-used many of the same sets from the first movie.

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Trivia: The script was specifically written to be set almost entirely in the same locations from the original "The Fly," as the studio wanted to get more use out of the sets before they were scrapped.

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Trivia: The film took nearly a decade to make. It was repeatedly placed on hold during production due to financial issues, and was slowly pieced together over eight years.

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Trivia: The film is comprised over over 180,000 individual hand-drawn animation cells, in addition to digital and 3D animation.

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Trivia: In the beginning of the film, young Sonic gives Longclaw a flower with spiky petals. This flower is actually based on a flower sprite from the original "Sonic the Hedgehog" video-game for the Sega Genesis. (00:02:16)

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Trivia: When Dr. Robotnik is picking out a song for the dance scene, you can briefly see the band "Crush 40" listed among the artists and playlists on his holographic projection. Crush 40 did music for the "Sonic the Hedgehog" video game series.

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Trivia: During the final battle, Sonic cripples Robotnik's ship by curling into a ball and bashing into it repeatedly. This is a reference to the video-games, in which Sonic deals damage to bosses (which are typically Dr. Robotnik) by jumping into a ball and crashing into them.

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Trivia: Sonic makes a few brief references to the "Fast and Furious" movie series. This movie is produced by the same team that produced those films.

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Trivia: During the bar scene, Sonic grabs some chili dogs out of the air and quickly wolfs them down. This is a reference to the overall "Sonic" franchise, in which his character absolutely loves chili dogs. (A fact that was first established in the cartoon "The Adventures of Sonic the Hedgehog," and was later incorporated in other media and even the video-game series).

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Trivia: The headband Sonic wears while practicing with his nunchucks features the emblem from the title screen for the original "Sonic the Hedgehog" video-game.

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Trivia: The evil creatures that attack Sonic and Longclaw at the beginning of the film are actually echidnas. Echidnas are a very important species in the "Sonic" video-game lore. (00:02:20)

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Trivia: Sonic's map of the different worlds he can go to with his rings includes a few hidden easter-eggs. In the bottom corner of the map is a picture of a "Chaos Emerald" from the video-games. There is also a world with a checkerboard pattern, which is a reference to the bonus stage from "Sonic the Hedgehog 3."

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Trivia: In Sonic's cave, he has repurposed a street-sign into a ping-pong table. If you look closely, the sign reads "Hill Top Rd. Next Exit." This is a reference to the level "Hill Top Zone" from the video game "Sonic the Hedgehog 2." (00:07:07)

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Trivia: The (quite bad) picture of Sonic that "Crazy Carl" holds up is a reference to "Sanic," an internet meme involving a poorly-drawn picture of Sonic.

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Trivia: The "Mushroom Planet" is a reference to the level "Mushroom Hill Zone" from the video-game "Sonic and Knuckles." (Although some have speculated it may also be a sly nod to the "Mushroom Kingdom" from the Nintendo video-game "Super Mario Bros.").

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Trivia: There is a mid-credits bonus scene featuring the popular character "Tails" from the video-game series.

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Trivia: The town in the movie is called "Green Hills." This is a reference to "Green Hill Zone," which was the name of the first level in the very first "Sonic" video-game. Additionally, a piano rendition of the "Green Hill Zone" music is played towards the end of the film. (00:03:55)

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Trivia: On the rooftop in San Francisco, at one point Sonic starts tapping his foot and looks at his wrist. This is a reference to the "idle animations" from the first few "Sonic" games for the Sega Genesis, in which he does something similar if the player doesn't push any buttons for a while.

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Trivia: The film was originally written to be an introspective, existential dramedy geared towards adults about a troubled man who is turned into a cat. As originally planned, the cat also wouldn't speak/the audience wouldn't hear his thoughts. However, after a change in leadership at the studio, the film was rewritten into a more generic family movie.

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